/* =========================================================
   德赢体育安装 · 共享站台样式  /assets/site.css
   冷底（夜空蓝 / 雪域白）+ 暖点（荧光绿 / 橙红），3px 框架语言
   ========================================================= */

:root{
  --ink-950:#02060F;
  --ink-900:#050D1C;
  --ink-800:#0A1A33;
  --ink-700:#14315E;
  --snow:#F4F7FB;
  --mist:#C9D6E8;
  --rock:#6B7A90;
  --graphite:#101418;
  --signal:#A8FF3E;
  --pulse:#FF5A2B;
  --ice:#3FA9F5;

  --line:3px solid var(--ink-900);
  --shadow-hard:6px 6px 0 var(--ink-900);
  --shadow-soft:5px 5px 0 rgba(10,26,51,.18);

  --font-sans:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
  --wrap:1360px;
  --gutter:clamp(1.15rem,4vw,3.5rem);
  --band:clamp(3.5rem,9vw,8.5rem);
}

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-sans);
  font-size:clamp(1rem,.96rem+.18vw,1.075rem);
  line-height:1.75;
  color:var(--graphite);
  background:var(--snow);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
img,picture,svg,video{max-width:100%}
img,svg,video{display:block}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;color:inherit}
a{color:var(--ice)}
hr{border:0;border-top:3px solid var(--ink-900);margin:var(--band) 0}

/* ---------- 排版 ---------- */
h1,h2,h3,h4{font-weight:900;line-height:1.12;letter-spacing:-.015em;margin:0 0 .6em;color:inherit}
h1{font-size:clamp(2.6rem,6vw,5rem)}
h2{font-size:clamp(1.75rem,3.6vw,2.85rem)}
h3{font-size:clamp(1.18rem,1.9vw,1.5rem)}
p{margin:0 0 1em}
.title-tilt{display:inline-block;transform:skewX(-2deg)}

.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

:focus-visible{outline:3px solid var(--ice);outline-offset:3px}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;top:-120px;left:var(--gutter);z-index:200;
  display:inline-block;padding:.7rem 1rem;
  background:var(--signal);color:var(--ink-900);
  font-family:var(--font-mono);font-size:.78rem;font-weight:700;letter-spacing:.06em;
  text-decoration:none;border:3px solid var(--ink-900);
  transition:top 180ms var(--ease);
}
.skip-link:focus{top:.8rem}

/* =========================================================
   页头：顶部索引导轨 + 三格主框架
   ========================================================= */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--ink-800);
  border-bottom:3px solid var(--signal);
}
.frame-rail{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  max-height:3rem;overflow:hidden;
  padding:.45rem var(--gutter);
  background:var(--ink-950);
  border-bottom:1px solid var(--ink-700);
  font-family:var(--font-mono);font-size:.7rem;font-weight:700;
  letter-spacing:.18em;text-transform:uppercase;
  transition:max-height 220ms var(--ease),opacity 220ms var(--ease),padding 220ms var(--ease);
}
.rail-mark{color:var(--snow)}
.rail-note{color:var(--mist);opacity:.72}
.site-header[data-scrolled] .frame-rail{max-height:0;opacity:0;padding-top:0;padding-bottom:0}

.header-frame{
  display:grid;
  grid-template-columns:minmax(220px,24%) minmax(0,1fr) auto;
  grid-template-areas:"brand nav actions";
  align-items:stretch;
  padding-inline:var(--gutter);
}
.brand-block{
  grid-area:brand;
  display:flex;align-items:center;
  padding:.9rem 1.4rem .9rem 0;
  border-right:3px solid var(--ink-700);
  transition:padding 220ms var(--ease);
}
.site-header[data-scrolled] .brand-block{padding-block:.6rem}
.brand{display:flex;align-items:center;gap:.75rem;text-decoration:none;color:var(--snow)}
.brand-mark{
  flex:0 0 auto;width:46px;height:46px;
  display:grid;place-items:center;
  background:var(--signal);color:var(--ink-900);
  font-family:var(--font-mono);font-size:.9rem;font-weight:700;letter-spacing:.02em;
  transform:skewX(-2deg);
  box-shadow:4px 4px 0 rgba(168,255,62,.2);
}
.brand-text{display:block;min-width:0}
.brand-name{display:block;font-size:1.06rem;font-weight:900;letter-spacing:.01em;transform:skewX(-2deg)}
.brand-tag{
  display:block;margin-top:.15rem;
  font-family:var(--font-mono);font-size:.66rem;font-weight:700;
  letter-spacing:.14em;color:var(--mist);opacity:.78;white-space:nowrap;
}

.header-nav{grid-area:nav;display:flex;align-items:stretch;min-width:0}
.nav-list{display:flex;flex-wrap:nowrap;align-items:stretch;flex:1 1 auto;height:100%;overflow-x:auto;scrollbar-width:none}
.nav-list::-webkit-scrollbar{display:none}
.nav-list li{display:flex;border-right:1px solid rgba(201,214,232,.16)}
.nav-list li:first-child{border-left:1px solid rgba(201,214,232,.16)}
.nav-link{
  display:inline-flex;align-items:center;height:100%;
  padding:0 clamp(.7rem,1.1vw,1.05rem);
  font-family:var(--font-mono);font-size:clamp(.72rem,.78vw,.8rem);font-weight:700;
  letter-spacing:.04em;white-space:nowrap;text-decoration:none;
  color:rgba(201,214,232,.88);
  border-bottom:3px solid transparent;
  transition:background-color 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease);
}
.nav-link:hover{background:rgba(168,255,62,.14);color:var(--snow)}
.nav-link[aria-current="page"]{background:var(--signal);color:var(--ink-900);border-bottom-color:var(--ink-900)}

.header-actions{
  grid-area:actions;
  display:flex;align-items:center;gap:.6rem;
  padding:.65rem 0 .65rem 1.1rem;
  border-left:3px solid var(--ink-700);
}

.scroll-progress{
  position:absolute;left:0;top:0;height:3px;width:0;
  background:linear-gradient(90deg,var(--signal),var(--pulse));
  transition:width 120ms linear;
}

/* ---------- 移动导航按钮 ---------- */
.nav-toggle{
  display:none;align-items:center;gap:.55rem;
  padding:.55rem .7rem;background:transparent;
  border:3px solid rgba(201,214,232,.42);color:var(--snow);
  font-family:var(--font-mono);font-size:.72rem;font-weight:700;letter-spacing:.1em;
  cursor:pointer;transition:background-color 180ms var(--ease),border-color 180ms var(--ease);
}
.nav-toggle:hover{background:var(--ink-700);border-color:var(--signal)}
.nav-toggle-bars{position:relative;display:block;width:18px;height:12px}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;height:3px;background:currentColor;
  transition:transform 200ms var(--ease),top 200ms var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{top:9px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:4.5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:4.5px;transform:rotate(-45deg)}

/* =========================================================
   按钮
   ========================================================= */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--snow);
  --btn-bd:var(--mist);
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.7rem 1rem;
  background:var(--btn-bg);color:var(--btn-fg);
  border:3px solid var(--btn-bd);
  font-family:var(--font-mono);font-size:.78rem;font-weight:700;
  letter-spacing:.06em;line-height:1;text-decoration:none;cursor:pointer;
  transition:transform 180ms var(--ease),box-shadow 180ms var(--ease),background-color 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease);
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 rgba(5,13,28,.55)}
.btn:active{transform:translate(2px,2px);box-shadow:none}
.btn-signal{
  --btn-bg:var(--signal);--btn-fg:var(--ink-900);--btn-bd:var(--ink-900);
  box-shadow:4px 4px 0 rgba(5,13,28,.55);
  animation:btn-pulse 2.4s ease-in-out infinite;
}
.btn-ghost{--btn-bg:transparent;--btn-fg:var(--snow);--btn-bd:rgba(201,214,232,.42)}
.btn-ghost:hover{--btn-bg:var(--ink-700);--btn-bd:var(--signal)}
.btn-line{--btn-bg:var(--snow);--btn-fg:var(--ink-900);--btn-bd:var(--ink-900);box-shadow:5px 5px 0 var(--ink-900)}
.btn-pulse{--btn-bg:var(--pulse);--btn-fg:var(--ink-900);--btn-bd:var(--ink-900);box-shadow:5px 5px 0 var(--ink-900)}
@keyframes btn-pulse{
  0%,100%{box-shadow:4px 4px 0 rgba(5,13,28,.55)}
  50%{box-shadow:9px 9px 0 rgba(5,13,28,.32)}
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  background:var(--ink-900);
  color:var(--mist);
  border-top:3px solid var(--signal);
}
.footer-frame{
  display:grid;
  grid-template-columns:minmax(240px,1.05fr) minmax(280px,1.5fr) minmax(220px,1fr);
  gap:clamp(1.6rem,4vw,3.5rem);
  padding-block:clamp(2.6rem,6vw,4.5rem);
}
.footer-brandline{
  margin:0 0 .8rem;color:var(--snow);
  font-size:1.14rem;font-weight:900;line-height:1.3;transform:skewX(-2deg);
}
.footer-note{margin:0 0 1.4rem;max-width:34ch;color:rgba(201,214,232,.82);font-size:.95rem;line-height:1.7}

.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(1rem,2.5vw,2rem)}
.footer-group-title{
  margin:0 0 .95rem;
  font-family:var(--font-mono);font-size:.72rem;font-weight:700;
  letter-spacing:.2em;text-transform:uppercase;color:var(--signal);
}
.footer-list{display:grid;gap:.5rem}
.footer-list a{
  display:inline-block;color:rgba(201,214,232,.86);
  text-decoration:none;font-size:.95rem;
  border-bottom:2px solid transparent;
  transition:color 180ms var(--ease),border-color 180ms var(--ease),transform 180ms var(--ease);
}
.footer-list a:hover{color:var(--snow);border-bottom-color:var(--signal);transform:translateX(3px)}

.footer-contact{min-width:0}
.contact-list{display:grid;gap:.9rem}
.contact-item{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem .6rem}
.contact-label{
  flex:0 0 100%;
  font-family:var(--font-mono);font-size:.68rem;font-weight:700;
  letter-spacing:.16em;color:rgba(201,214,232,.72);
}
.contact-value{color:var(--snow);font-size:.92rem;line-height:1.5;word-break:break-word}
.copy-btn{
  padding:.22rem .5rem;background:transparent;
  border:2px solid rgba(201,214,232,.4);color:rgba(201,214,232,.86);
  font-family:var(--font-mono);font-size:.66rem;font-weight:700;letter-spacing:.1em;
  cursor:pointer;transition:background-color 180ms var(--ease),color 180ms var(--ease),border-color 180ms var(--ease);
}
.copy-btn:hover,.copy-btn.is-done{background:var(--signal);border-color:var(--signal);color:var(--ink-900)}

.footer-base{background:var(--ink-950);border-top:3px solid var(--ink-700)}
.footer-base-inner{
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding:1.05rem var(--gutter);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:.7rem 1.6rem;
  font-family:var(--font-mono);font-size:.74rem;font-weight:700;letter-spacing:.06em;
  color:rgba(201,214,232,.78);
}
.footer-legal,.footer-icp{margin:0}
.footer-legal-links{display:flex;flex-wrap:wrap;gap:.4rem 1.2rem}
.footer-legal-links a{color:var(--mist);text-decoration:none;border-bottom:2px solid transparent}
.footer-legal-links a:hover{color:var(--signal);border-bottom-color:var(--signal)}

/* =========================================================
   基础版式组件
   ========================================================= */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}

.canvas{display:grid;gap:clamp(1.75rem,4vw,3rem);grid-template-columns:minmax(0,1fr)}
@media (min-width:1080px){
  .canvas{grid-template-columns:minmax(200px,26%) minmax(0,1fr)}
  .canvas--wide{grid-template-columns:minmax(200px,32%) minmax(0,1fr)}
}

.band{padding-block:var(--band)}
.band--snow{background:var(--snow);color:var(--graphite)}
.band--mist{background:var(--mist);color:var(--graphite)}
.band--ink{background:var(--ink-800);color:var(--snow)}
.band--deep{background:var(--ink-900);color:var(--mist)}
.band--ink h2,.band--ink h3,.band--deep h2,.band--deep h3,.band--ink h1,.band--deep h1{color:var(--snow)}
.band--ink p,.band--deep p{color:rgba(244,247,251,.86)}
.band--ink .eyebrow,.band--deep .eyebrow{color:var(--signal)}
.band--ink a,.band--deep a{color:var(--signal)}

.prose{max-width:70ch}
.prose p{max-width:68ch;margin:0 0 1.15em}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.4rem;max-width:68ch}
.prose ul{list-style:square}
.prose ol{list-style:decimal}
.prose li{margin-bottom:.45em}
.prose strong{font-weight:700}
.prose a{color:var(--ice);text-decoration:none;border-bottom:2px solid rgba(63,169,245,.45)}
.prose a:hover{border-bottom-color:var(--ice);background:rgba(63,169,245,.12)}
.band--ink .prose a,.band--deep .prose a{color:var(--signal);border-bottom-color:rgba(168,255,62,.45)}
.band--ink .prose a:hover,.band--deep .prose a:hover{border-bottom-color:var(--signal);background:rgba(168,255,62,.14)}

.section-head{display:grid;gap:.85rem;margin-bottom:clamp(1.8rem,4vw,3rem)}
.eyebrow{
  display:inline-flex;align-items:center;gap:.6rem;
  font-family:var(--font-mono);font-size:.72rem;font-weight:700;
  letter-spacing:.2em;text-transform:uppercase;color:var(--ink-700);
}
.eyebrow::before{content:"";width:22px;height:3px;background:var(--signal)}
.eyebrow--pulse::before{background:var(--pulse)}
.section-title{margin:0;font-size:clamp(1.75rem,3.6vw,2.85rem);font-weight:900;line-height:1.1;letter-spacing:-.02em}
.lede{max-width:60ch;font-size:1.05rem;line-height:1.7;color:rgba(16,20,24,.78)}
.band--ink .lede,.band--deep .lede{color:rgba(244,247,251,.82)}

.frame-box{
  border:3px solid var(--ink-900);background:#fff;
  padding:clamp(1.2rem,3vw,2rem);
  box-shadow:var(--shadow-hard);
}
.frame-box--signal{background:var(--signal);color:var(--ink-900)}
.frame-box--ink{background:var(--ink-800);color:var(--snow);border-color:var(--ink-900);box-shadow:6px 6px 0 var(--pulse)}
.frame-box--ink h3,.frame-box--ink h2{color:var(--snow)}

.tag{
  display:inline-flex;align-items:center;gap:.4rem;
  padding:.28rem .55rem;border:2px solid var(--ink-800);color:var(--ink-800);
  font-family:var(--font-mono);font-size:.7rem;font-weight:700;letter-spacing:.06em;
  background:transparent;
}
.tag--signal{background:var(--signal);border-color:var(--ink-900);color:var(--ink-900)}
.tag--pulse{background:var(--pulse);border-color:var(--pulse);color:var(--ink-900)}

.data{font-family:var(--font-mono);font-size:.86rem;font-weight:700;letter-spacing:.02em}
.data--pulse{color:var(--pulse)}
.data--signal{color:var(--signal)}

.pulse-dot{
  display:inline-block;width:10px;height:10px;background:var(--pulse);
  box-shadow:0 0 0 3px rgba(255,90,43,.25);
  animation:dot-pulse 2.4s ease-in-out infinite;
}
@keyframes dot-pulse{0%,100%{opacity:1}50%{opacity:.4}}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  font-family:var(--font-mono);font-size:.72rem;font-weight:700;
  letter-spacing:.08em;color:var(--rock);margin-bottom:1.4rem;
}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem}
.breadcrumb li{display:flex;align-items:center;gap:.45rem}
.breadcrumb li+li::before{content:"/";color:var(--rock)}
.breadcrumb a{color:var(--ink-700);text-decoration:none;border-bottom:2px solid transparent}
.breadcrumb a:hover{color:var(--ink-900);border-bottom-color:var(--pulse)}
.band--ink .breadcrumb a,.band--deep .breadcrumb a{color:var(--mist)}

/* ---------- 图片容器（页面阶段放 img 即可） ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  aspect-ratio:16/10;
  border:3px solid var(--ink-900);
  background:var(--ink-700);
  box-shadow:var(--shadow-hard);
}
.media-frame>img,.media-frame>picture>img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.06)}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame--flat{box-shadow:none}
.media-duo{display:grid;gap:clamp(.9rem,2vw,1.5rem);grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.media-cap{
  position:absolute;left:0;bottom:0;right:auto;
  padding:.35rem .65rem;background:var(--ink-900);color:var(--mist);
  font-family:var(--font-mono);font-size:.7rem;font-weight:700;letter-spacing:.06em;
}
.media-frame--offset{transform:translateY(clamp(-24px,-2vw,-12px))}

/* ---------- 表格 / 数据 ---------- */
.table-scroll{overflow-x:auto;border:3px solid var(--ink-900);box-shadow:var(--shadow-soft);background:#fff}
.table-mono{width:100%;border-collapse:collapse;font-size:.92rem;min-width:520px}
.table-mono th,.table-mono td{border-bottom:3px solid var(--ink-900);border-right:3px solid var(--ink-900);padding:.7rem .85rem;text-align:left;vertical-align:top}
.table-mono th:last-child,.table-mono td:last-child{border-right:0}
.table-mono tbody tr:last-child td{border-bottom:0}
.table-mono thead th{
  background:var(--ink-800);color:var(--snow);
  font-family:var(--font-mono);font-size:.74rem;font-weight:700;letter-spacing:.1em;
}
.table-mono tbody tr:nth-child(even){background:rgba(201,214,232,.32)}

/* ---------- 时间流条目 ---------- */
.entry{
  position:relative;display:grid;gap:.5rem;
  padding:1.1rem 0 1.1rem 1.15rem;
  border-left:3px solid var(--mist);
  transition:border-color 220ms var(--ease),transform 220ms var(--ease);
}
.entry:hover{border-left-color:var(--signal);transform:translateX(3px)}
.entry-time{
  font-family:var(--font-mono);font-size:.74rem;font-weight:700;
  letter-spacing:.06em;color:var(--pulse);
}
.entry-title{margin:0;font-size:1.06rem;font-weight:900}
.entry-body{margin:0;max-width:66ch;font-size:.95rem;color:rgba(16,20,24,.82)}
.band--ink .entry,.band--deep .entry{border-left-color:var(--ink-700)}
.band--ink .entry-body,.band--deep .entry-body{color:rgba(244,247,251,.8)}

/* ---------- 折叠问答复用 ---------- */
.faq-item{
  border:3px solid var(--ink-900);background:#fff;
  box-shadow:var(--shadow-soft);margin-bottom:1rem;
}
.faq-item summary{
  display:flex;align-items:baseline;gap:.7rem;
  padding:.95rem 1.1rem;cursor:pointer;font-weight:700;list-style:none;
  transition:background-color 180ms var(--ease);
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::before{content:"＋";font-family:var(--font-mono);color:var(--ink-700);font-weight:700}
.faq-item[open] summary::before{content:"－";color:var(--pulse)}
.faq-item[open] summary{background:rgba(168,255,62,.22);border-bottom:3px solid var(--ink-900)}
.faq-body{padding:1rem 1.1rem .4rem}

/* ---------- 章节索引（长文跟随） ---------- */
.toc{font-family:var(--font-mono);font-size:.8rem}
.toc-title{
  margin:0 0 .8rem;font-size:.7rem;font-weight:700;
  letter-spacing:.2em;text-transform:uppercase;color:var(--ink-700);
}
.toc-list{display:grid;gap:.2rem;border-left:3px solid var(--mist)}
.toc-link{
  display:block;padding:.45rem .85rem;
  color:var(--rock);text-decoration:none;
  border-left:3px solid transparent;margin-left:-3px;
  transition:color 200ms var(--ease),border-color 200ms var(--ease),background-color 200ms var(--ease);
}
.toc-link:hover{color:var(--ink-800);background:rgba(20,49,94,.06)}
.toc-link[aria-current="true"]{
  color:var(--ink-900);font-weight:700;
  border-left-color:var(--signal);background:rgba(168,255,62,.2);
}
.band--ink .toc-list,.band--deep .toc-list{border-left-color:var(--ink-700)}
.band--ink .toc-link,.band--deep .toc-link{color:rgba(201,214,232,.7)}
.band--ink .toc-link[aria-current="true"],.band--deep .toc-link[aria-current="true"]{color:var(--ink-900);background:var(--signal)}

/* ---------- 返回顶部 ---------- */
.back-to-top{
  position:fixed;right:clamp(1rem,3vw,2.2rem);bottom:clamp(1rem,3vw,2.2rem);z-index:70;
  width:52px;height:52px;display:grid;place-items:center;
  background:var(--ink-800);color:var(--signal);
  border:3px solid var(--signal);cursor:pointer;
  font-family:var(--font-mono);font-size:1.1rem;font-weight:700;line-height:1;
  box-shadow:5px 5px 0 rgba(5,13,28,.28);
  opacity:0;visibility:hidden;transform:translateY(12px);
  transition:opacity 240ms var(--ease),transform 240ms var(--ease),visibility 240ms,background-color 180ms var(--ease),color 180ms var(--ease);
}
.back-to-top.is-on{opacity:1;visibility:visible;transform:none}
.back-to-top:hover{background:var(--signal);color:var(--ink-900)}

/* ---------- 进场 ---------- */
[data-reveal].is-visible{animation:reveal-rise 320ms var(--ease) both}
@keyframes reveal-rise{
  from{opacity:0;transform:translateY(12px)}
  to{opacity:1;transform:none}
}

/* =========================================================
   断点
   ========================================================= */
@media (max-width:1080px){
  .footer-frame{grid-template-columns:minmax(0,1fr) minmax(0,1.2fr)}
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:980px){
  .header-frame{
    grid-template-columns:minmax(0,1fr) auto;
    grid-template-areas:"brand actions" "nav nav";
  }
  .brand-block{border-right:0;padding-right:.6rem}
  .header-actions{border-left:0;padding-left:0}
  .nav-toggle{display:inline-flex}
  .header-nav{display:none;border-top:3px solid var(--ink-700);padding-block:.35rem}
  .header-nav[data-open]{display:block;animation:nav-drop 240ms var(--ease) both}
  .nav-list{flex-direction:column;height:auto;overflow:visible}
  .nav-list li{border-right:0;border-bottom:1px solid rgba(201,214,232,.16)}
  .nav-list li:first-child{border-left:0}
  .nav-list li:last-child{border-bottom:0}
  .nav-link{width:100%;height:auto;padding:.85rem .2rem}
  .nav-link[aria-current="page"]{padding-inline:.6rem}
  .footer-nav{grid-template-columns:repeat(auto-fit,minmax(130px,1fr))}
}
@keyframes nav-drop{
  from{opacity:0;transform:translateY(-6px)}
  to{opacity:1;transform:none}
}

@media (max-width:720px){
  .frame-rail .rail-note{display:none}
  .brand-mark{width:40px;height:40px;font-size:.8rem}
  .brand-tag{font-size:.62rem;letter-spacing:.1em}
  .footer-frame{grid-template-columns:minmax(0,1fr)}
  .footer-base-inner{justify-content:flex-start}
}

@media (max-width:560px){
  .header-actions .btn-ghost{display:none}
  .btn{padding:.62rem .8rem;font-size:.74rem}
  .nav-toggle-text{display:none}
  .contact-item{flex-direction:column;align-items:flex-start}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  [data-reveal].is-visible{animation:none}
  .btn-signal{animation:none;box-shadow:4px 4px 0 rgba(5,13,28,.55)}
  .pulse-dot{animation:none}
}